These things are supper usefull in any 'garage' hobby. I have several.
My advice, for plastic, get some BK3010(link for reference only) bits.
The ones in OP post are 1010, are larger and thicker, and used mainly for steel. You could use them on plastic, but I prefer the smaller BK3010s.
Also, please be careful using tools like these, don't stab yourself with them.